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Gnoma [55]
3 years ago
6

Ariah has a hot air balloon. When full, the balloon is a sphere with a radius of 9 meters. She fills it with hot air whose densi

ty is 0.9 kilograms per cubic meter. Since this is less dense than the air in the atmosphere, the balloon is carried upwards.
What is the weight of the air that Ariah needs to fill the balloon?
Mathematics
1 answer:
Anika [276]3 years ago
5 0

Answer:2748

Step-by-step explanation:

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for question 1

Area of Base B =45×25 = 1125 cm²

perimeter of base P = 2(45+25) = 140 cm

Height = 15 cm

Using the formula

Surface area = 2B + Ph

A = 2×1125 + 140×15= 4350 cm²

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For question 2,

Area of base = 7× 5/2= 17.5 cm²

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Surface area of prism = 2×17.5+ 21×10 = 245cm²

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spayn [35]
What is the area of the shaded region and the circle inside?

r=20,1m+13,2m=33,3m
A_1=\pi r^2
A_1=33,3^2\pi
A_1=1108,89\pi

What is the area of the circle inside?

A_2=20,1^2\pi
A_2=404,01\pi

What is the area of the shaded region?

1108,89\pi -404,01\pi =704,88\pi
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The answer: 2213,32 :)
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2 years ago
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